void _OnRawCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
// If an item got added, was it something we care to see?
Assert.AreEqual(1, e.NewItems.Count);
var newPost = (ActivityPost)e.NewItems[0];
if (_IsInteresting(newPost.Actor))
{
_filteredCollection.Add(newPost);
_interestMap[newPost.Actor] = true;
}
break;
case NotifyCollectionChangedAction.Move:
_filteredCollection.RefreshSort();
break;
case NotifyCollectionChangedAction.Remove:
// If an item got removed, was it one we were really showing?
Assert.AreEqual(1, e.OldItems.Count);
var oldPost = (ActivityPost)e.OldItems[0];
if (_IsInteresting(oldPost.Actor))
{
if (_filteredCollection.Remove(oldPost))
{
if (!_filteredCollection.Any(post => post.Actor.UserId == oldPost.Actor.UserId))
{
oldPost.Actor.PropertyChanged -= _OnContactPropertyChanged;
_interestMap.Remove(oldPost.Actor);
}
}
}
break;
case NotifyCollectionChangedAction.Replace:
// Unsupported
Assert.Fail();
break;
case NotifyCollectionChangedAction.Reset:
foreach (var contact in _interestMap.Keys)
{
contact.PropertyChanged -= _OnContactPropertyChanged;
}
_interestMap.Clear();
_filteredCollection.Clear();
break;
}
}
internal FacebookPhotoAlbumCollection(FBMergeableCollection <FacebookPhotoAlbum> sourceCollection, FacebookService service, FacebookContact owner)
: base(sourceCollection, service)
{
VerifyAccess();
if (owner != null)
{
_rawCollection = sourceCollection;
_owner = owner;
_filteredCollection = new FBMergeableCollection <FacebookPhotoAlbum>(from album in sourceCollection where album.OwnerId == owner.UserId select album, false);
base.ReplaceSourceCollection(_filteredCollection);
sourceCollection.CollectionChanged += _OwnerFilterOnRawCollectionChanged;
}
// A null owner implicitly means that the album collection is filterable
else
{
_interestMap = new Dictionary <FacebookContact, bool>();
_rawCollection = sourceCollection;
_filteredCollection = new FBMergeableCollection <FacebookPhotoAlbum>(false);
base.ReplaceSourceCollection(_filteredCollection);
foreach (var album in sourceCollection)
{
album.PropertyChanged += _OnAlbumOwnerUpdated;
if (album.Owner != null)
{
lock (_localLock)
{
if (!_interestMap.ContainsKey(album.Owner))
{
_interestMap.Add(album.Owner, _IsOwnerInteresting(album));
album.Owner.PropertyChanged += _OnContactPropertyChanged;
}
}
album.PropertyChanged -= _OnAlbumOwnerUpdated;
if (_IsOwnerInteresting(album))
{
_filteredCollection.Add(album);
}
}
}
sourceCollection.CollectionChanged += _InterestFilterOnRawCollectionChanged;
}
}
private void _OnAlbumOwnerUpdated(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == "Owner")
{
var album = (FacebookPhotoAlbum)sender;
album.PropertyChanged -= _OnAlbumOwnerUpdated;
lock (_localLock)
{
if (!_interestMap.ContainsKey(album.Owner))
{
_interestMap.Add(album.Owner, _IsOwnerInteresting(album));
album.Owner.PropertyChanged += _OnContactPropertyChanged;
}
}
if (_IsOwnerInteresting(album))
{
_filteredCollection.Add(album);
}
}
}
